^^^ And Brian's car is an early build.
So we have a January and an April build with star, and a March build without star.
Since the cowl plate only determines how the body shell was built, and not which options were later installed at the assembly plant, I wouldn't think the cowl plate would have anything to do with what wheels were later bolted on the car.
The 1966 cowl plates added a hole punch when the car had front seat shoulder belt reinforcements added to the body.
I would guess the 65 star may indicate a similar mod to the body shell. Just as an example, maybe rear seat belt mounts. ( was that a 64 or 65 addition?).
The fact the star is Flint-only and appears on builds throughout the model year adds to the mystery!